clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- `FilterTransform` re-hashes column names on every chunk; `ExpressionTransform` is positional since #109380 but the filter is not
- Sort-order-aware join ordering: let DPsub choose `full_sorting_merge` by cost when join inputs are sorted (interesting orders)
- Typed binary search over the set in primary key analysis of IN
- IN rewrite for dictGetDateTime misinterprets literal time zone (#100001)
- IN rewrite for dictGet over LowCardinality float key mis-handles -0.0
- Fix flaky test `test_store_cleanup`
- `WHERE s = const` makes multiSearch*/timestamp throw ILLEGAL_COLUMN
- Server crash building projection with `WHERE` on `Tuple` equality
- Plan-based parallel replicas: a read from a `UNIQUE KEY` table is shipped and throws `SUPPORT_IS_DISABLED`
- Experiment: two-level hash table buckets in one memory area with transparent huge pages
- Docs
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